Metal-shearing machine



3 Sheets-Sheet 2.

(No Model.)

J. B. MGLANE. METAL SHBARING MACHINE.

Patented Oct. 13, 1896.

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J. B. MGLANE.

METAL SHBARING MACHINE.

No. 569,226. Patented Oct. 13, 1896.

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.IARED B. HCLAN, OF READING, MASSACHUSETTS.

METAL-SHEARING MACHINE.

SPECIFICATION forming part of Letters Patent No. 569,226, dated October13, 1896.

Application tiled February Z8, 1896. Serial No. 581,202. (No model.)

:To @ZZ whom it may con/cern,.-

Be it known that I, JARED B. MCLANE, of Reading, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Metal-Shearing Machines, of which the followingis a specification.

This invention relates to metal-shearing machines, and has for itsobject to provide a simple and eicient machine adapted to be operated byhand and to be quickly adjusted for the performance of different kindsof work, or, in other words, changed from the conditions which are mostadvantageous when heavy pressure is required, as in cuttingcomparatively thick and heavy pieces, to the conditions which aredesirable when lighter pressure is required.

To this end the invention consists in certain novel features ofconstruction and combinations of parts hereinafter described, and particularly pointed out in the appended claims.

Of the accompanying drawings, forming a part of this specification,Figure l represents a side elevation of a shearing-machine embodying myinvention. Fig. 2 represents an end elevation of the same. Fig. 3represents a perspective view of a portion of one of the shear-blades.Fig. 4 represents a section on line 4 4 of Fig. l. Fig. 5 represents aside elevation showing certain additional features. Figs. 6 and 7represent, respectively, a side view and an end view, showing certainfeatures hereinafter described.

The same letters and numerals of reference indicate the same parts inall the figures.

In the drawings, a represents a fixed supporting-frame, and h representsa stout lever, one end of which is pivoted at b to ears formed atone'end of the frame a, said lever extending lengthwise of the frame,its free end being located at the opposite end of the frame from thepivoted end.

c represents a iixed operating member mounted on the frame a, saidmember being, as here shown, a shear-blade.

c represents a movable operating member secured to the lever b andarranged to cooperate with the xed member c.

Each of the members c c in a shearing-machine is preferably composed ofa rectangular piece of metal, the angles 2 2 2 2 of which forminterchangeable shearing or cutting edges, either of which may bebrought into operative position by suitably changing the position of thesaid operating member.v Said members are inserted in recesses formed fortheir reception in the frame a and lever b, and are secured in saidrecesses by taperheaded bolts 3, the tapered heads of which engagerecesses 4, formed in the ends of the said members. (See Figs. 3 andat.) A single bolt 3, with its accompanying nut 5, is sufficient tosecure one of the said members, the tapering form of the head pressingthe member endwise against the opposite end of the recess which receivesit. Each member is therefore adapted to be quickly secured and removed.

d represents a cam-head pivoted at d' to an ear a', formed on the framea and comprising two cams G 7, either of which is adapted to bear uponthe upper edge of the lever b at a point near its swinging end.

The head d is provided with an operating arm or lever d2, which isgrasped by the operator, who is thereby enabled to turn the head ineither direction and thus force either of the said cams against thelever b. The cam 6 has alesser total rise from the pivot d' than the caml7, its rise being more gradual, so that when the cam is thrown to theextreme of its movements (shown in Fig. 1') it gives the lever b alimited downward movement at a comparatively slow rate. The cam 7 has agreater total rise than the cam 6, its rise being more abrupt, so thatwhen the head dand its operating-arm d2 are thrown over to the oppositeside of the pivot from that shown in Fig. l the cam 7 will give thelever b a quicker downward movement than that imparted by the cam 6.Owing to the described form of the cams, the cam 6 is enabled to exertgreater power upon the lever b and the operating member c' than the cam7, although moving said lever more slowly and through a shorter path.Hence, when comparatively thick heavy metal is to be cut the cam 6 isemployed, the muscular force of the operator being' enabled to cut aplate or piece IOO of metal that could not be cut by the use of ing-armd2 are reversed to bring the cam 1 into action, thisf cam giving a morerapid, although less powerful, movement to the lever l) and operatingmember c'. Hence in cutting coinparatively-light pieces the operator canwork more rapidly than by the use of the cam G.

The shorter cam of course does not move the lever b to the same extentas the longer cam, and while the latter causes the edge of the blade c/to pass the edge of the blade c throughout the full length of theblades, the former only causes said edges to pass each other through apart of their length, as shown in Fig. 1. This does not, however, affectthe operativeness of the machine, for the material intended to be cut byuse of the shorter cam is limited in lateral extent, and in order tosever it it is not necessary that the shearing-blades come togetherthroughout their length. In this connection it is to be noted that it isessential to the successful employment of the double-acting cam that themovable cutting member be carried by a lever, for then under differentextents of movement of the lever the blades can be caused to cut, themovable blade always starting from the same position and its cuttingedge passing that of the fixed blade through greater or less of itslength according as the longer or shorter cam is used.

e represents a guard which is secured to the frame c and is arranged tobear upon the upper side of a piece of metal while it is being cut bytheV operating members and prevent the piece from tipping upwardly, saidguard, as here shown, having downwardlybent ends e e', which are securedby bolts e2 to the frame ce. The guard may, however, be of any othersuitable construction, and may be applied to the frame yin any othersuitable way. I prefer to make the guard adjustable, and to this end Ihave provided additional holes e3 to receive the bolts e2, so that theguard may be raised or lowered on the frame.

To insure operative contact of the blades or operating members c c witheach other, I p

provide adjustable bearing-plates f, one of which is shown in dottedlines in Fig. 2, said plates being located in recesses in the ear a andheld by set-screws f against one side of the leverb. The said plate andscrews press the plate or member c' on the lever h toward the fixedmember c. When the contacting sides of the said blades or members becomeworn, the wear can be compensated for by setting up the screws f.

g represents a curved spring-arm which is engaged at one end with a studg, affixed lby welding or otherwise to the lever b, and at the other endwith a stud g2, affixed to the cam-head CZ, and acts to yieldingly holdthe lever Z) in contact with the cam-head, the ends of the spring havinga tendency to spring toward each other. By thus supporting the spring Iavoid, all resistance by the spring to the downward movement of thelever.

In Fig. 5 I show the lever ZJ provided with an extension b3, to theouter end of which is pivoted a lever b4, connected by arod h5 with alever 196, which is engaged with the camhead CZ. The rod b5 isadjustably connected to the levers b4 and h6, so that it can be set atvarious distances from the pivots of said levers. The described systemof levers enables the operator to exert greater power on the lever b bygrasping the lever h4. Vhen this extra power is not required, the rod h5may be disconnected and the cam-head operated by the lever h6.

As above indicated, my invention may be embodied in a machine adaptedfor punching instead of shearing, suitable punchingdies beingsubstituted for the shear blades or members here shown.

For the sake of convenience, I have referred in some of the followingclaims to the lever b as a carrier and to the lever b4 (shown in Fig. 5)as a primary operating-lever.

In Figs. G and '7 I show the cam-head d provided with a cam-shapedgroove d5, which receives a stud CZ on an arm (Z7, affixed to the leverb. Said cam is formed to impart upand-down movements to the lever bthrough the arm d?, and to hold the lever h at all times in operativebearing against the cam-head. This arrangement is more positive andreliable than the spring g. (Shown in Figs. l and 2.)

In Figs. 6 and 7 I show also a guard or rest e5, composed of an angularbar, the lower end of which is bent inwardly and secured to the bottomof the frame by means of a block e6, secured by a bolt e7 to the frameu.. By loosening the bolt e7 the rest e5 can be released and removedfrom the machine.

I claiml. In a'machine of the character specified,

the combination of a supporting-frame hav-- IOO IIO

ing a fixed shear-blade; a lever pivoted at one end to said frame andcarrying a shearblade adapted to coperate with that on thesupporting-frame and a cam-head pivoted to the supporting-frame,arranged to bear on the Swingin g end of the lever, and having twointerchangeably-operative differentiated camsurfaces and a mediansurface nearest the pivot, whereby movement of the cam-head from aposition where said median surface engages the lever may operate toengage either cam-surface with the lever, each camsurface having asufficient total rise to bring the shear-blades together but sodilferentiated that one brings said blades together through a greaterportion of their length than the other under the same extent of movementof the cam-head, substantially as and for the purpose described.

2. In a machine of the character specified, the combination of asupporting-frame having a fixed cutting member, a lever pivoted pivot ofthe head; an arm fastened to the lever and engaging the cam-groove onthe 15 upper side of the pivot; and an operating arm or lever on thecam-head.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 19th day of 2o February, A.D. 1895.

JARED B. MCLANE.

Witnesses:

A. D. HARRISON, A. D. ADAMS.

